Plate cooling and finishing machine



O. ROESEN.

PLATE COOLING AND FINISHING MACHINE.

' Y APPLICATION FILED .IULY I4, 1919. 1,389,844. PatentedSept 6, 1921.

3 SHEETS-SHEET I.

0. ROESEN.

PLATE COOLING AND FINISHING MACHINE.

APPLICATION FILED JULY I4, I9I9.

Patented Sept. 6, 1921.

3 SHEETS-SHEET 2.

O. ROESEN.

PLATE CO0L|NG,AND FINISHING MACHINE.

APPLICATION FILED JULY I4, 1919.

Patentedsept. 6, 1921.

3 SHEEIS-SHEET 3.

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INVENTORS. Mm

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UNITED STA'rsS PATENT OFFICE.

' 'OSCAR ROESEN, OF NEW YORK, N. Y., ASSIGNOR T0 R. HOE AND C0., 0F NEW YORK,

y N. Y., A conroaa'rioiv or NEW YORK.

PLATE COOLING AND FINSI-IING MACHINE.

1,.389,84let.V

Application filed .Tuly 14,

To all whom t may concern.-

Be it known that I, OSCAR RoiisEN, a citizen of the United States, residing at New York city, county of Kings, and State of New York, have invented certain new and useful Improvements in Plate Cooling and Finishing Machines, fully described andr represented in the following specification and l, the accompanying drawings, forming a part 10 of the same.

This inventionl relates to certain improvements in machines for treating stereotype and similar printing plates.

It is the especial object of the invention to provide a. construction in which a finished stereotype or similarv plate may be supported at a point or points intermediate its straight edges and brought into cooling relation with a cooling bath while thus supported. It is a further object of the invention to produce a construction in which a plate thus supported is cooled by rotating it through a cooling bath.

It is a further object of the invention to provide such a cooling device in combination with a finishing mechanism in which the plate may be automatically delivered from the finishing mechanism to thecooling carrier and in which the carrier is stopped to hold the plate in the bath during the period required for forwarding a second plate to the carrier, and in which the cooled and nished plate is automatically delivered from the cooling carrier.

It is a further object of .the invention to provide supporting devices by which `the plate is supported intermediate its straight edges during its movement' to and from the finishing mechanism when used and to, on and from the rotary cooling carrier.

It is a further object of the invention to provide automatic means for forwarding a finished plate, from the finishing mechanism to cooling positionrand from cooling position to a suitable delivery in which the forwarding mechanism is set in motion by an incoming plate which is 'being forwarded to i ySpeciiieatioii of Letters Patent.

- attention on the Patented Sept. 6, 1921.

1919. Serial N0. 310,663.

the finishing mechanism, thus requiring no part of the operator for forwarding a finished plate to the cooling carrier or delivering a cooled plate therefrom.

Viththese and other objects not specifically. referred to in view, the invention consists inv certain novel parts and combinations `which will be hereinafter described in conknection with the accompanying drawings,

which show the preferred embodiment of the invention and in whichh Figure l is acentral vertical section partly broken away of the improved cooling device shown in combination with a plate finishing mechanism.

Fig. 2 is a central section partly broken p awayshowing certain of the parts illustrated struction shown in Fig. l, the section being parts being shown in a differtaken on line 3-3 of that figure.

Fig. 4 is a detail view partly broken away and partly in section showing on an enlarged scale the mechanism for starting the niachine.

Fig. 5 is an end view partly in section taken on the line 5-5 of Fig. l, showing iu end elevation the mechanism shown in F 4.

Fig. 6 is a detail plan view of the construction shown in Fig. 5.

Fig. 7 is a sectional detail on an enlarged scale showing the method of mounting and driving' the rotary cooling carrier.

Fig. 8 is a vertical cross section of the rotary cooling carrier and tank, the section being taken on line 8 8 of Fig. l,

Fig. 9 is a detail sectional view of the plate feeding mechanism used for feeding the plates out of the finishing mechanism and to and from the cooling carrier, the section being taken on line 9-9 of Fig. l; and

Fig. l0 is a detail sectional view showing the feeding pawl and its spring, the section being taken on line 1.0*10 of Fig. 9. Referring now to the drawings, the invention has been illustrated as embodied in Y a combined machine for both finishing and cooling the plates. It will be understood, however, that if desired, the cooler may be used alone or in conjunction with a finishing mechanism of a type other than that here shown. The invention will, however, be described in connection with the finishing'machine shown, and for convenience the finishing of the plate will be described first.

Whatever the type of finisher employed,1

however, preferably the-hot vplate willbe supported at points intermediate its straight edges, while it is being'directed into the finishing mechanism, and while it is being moved fromtlie finishing mechanism to the cooler, and while it is on the cooler.V

In the particular construction illustrated,`

there is provided a plate.V support on which the hot plate is placed by the operator. This support is of such Character as to support the plate on its inner periphery `so that the weight of the plate is taken off its straight edges. y ln'the particular construction illustrated, there is provided ablock 1, suitably supported in frames 2, of any usualor suitableconstruction, which support the various parts of the machine. This block 1 forms a support for a head or plate 3 in which are mounted atone end a plurality of supports in the form of bars 4. These supportv ing bars are provided in sufficient numbers to form an effective support for the plate, four such bars being shown. These bars 4 at their other end are mounted in a similar plate or head 5, which is mountedfin any suitable manner as by being secured (see Fig.

V7) through screws 6 tothe bearing 7. of the yfinishing knife carrier bar 8, hereinafter re- The head 5 is as shown, at the f.

ferred to. t delivery end of the finisher, and the bars extend from thehead 3 through the finisher thus providing a continuous support for the plate to and through the finishing mechanism, this support being located intermediate the straight edges of theplates and ac ting to keep the Weight of the plates off such edges. t t Y The particular character of the nishing mechanism may be widely varied, but in the best constructions the plate will be fedinto the finisher by hand, the finisher then started vto finish the platel and the plate automati- V cally removed from the finisher to the cooler.

And, furthermore,1 in the best type kof the machine the finisher will be such that the inside of the plate is shaved or finished by rotating the plate around a fixed knife. In Vthe particular constructionillustrated, the

finisher is in the form of a shell 9 into which the plate is fed, andv in which it is clamped so that it can be rotated with Athe shell 'to' effect the 'finishing operation. Various vclamping means may be employed for-lockingthe plate in the shell. In the particular construction illustrated, there is provided in g the operation of; the latter, and for preventing the finishing mechanism from acting while the Vplate-is being moved into or out of the finisher. And in the best constructions, these vmeans will be such as to be controlled by the entering plate. Vhile this may be effectedV in various ways, in the particular construction illustrated, there is provided a roll V13. (see Figs. 1, 2 and'4) which is normally in theV path of the enteringplate and with which the plate contacts, as shown'in F ig. 1. This roll is `carried on a .rock arm 14 which rocksaround a continuously driven shaftl. This rock armk at its other end carries abearing 16V (see Fig. 5) in which is ashort verticalshaft 17, whichat its upper end carries a miter 18 which meshes with a miter 19 onl the shaft 15, before referred to. .The shaft 17 carries a worm 20, which is arrangedwhen the rock arm 14-is operated by the*V plate, to be swung into engagement with asector 21 on a short shaft 22 supported in brackets 23,'-suitably 100 secured to the frame of the machine. The shaft 22 carries fast thereonH a lever arm 24 which is connected vto one end of an actuator rod .25. The other end yof this rod 25 carries a block 26 in which is adjustably 105 supported at oneend a rod 27, Vthe other end 0f this rod carrying a yoke 28 (see Fig. 3) in which is mounted a stud V29, which carries a pair of large gears 30 and a small gear 31. .The gears 30 mesh with a sliding rack 110 32 which-carries apair of plate forwarding pawls 33 which are normally pressed into forwarding position by springs 33', andthe A small gear 31 meshes with'a stationary rack 34 suitably supported in any suit-able man- 1715 ner, as by the cutter bar,fbefore referred to,

f and the bearing 7 of the-cutter bar shaft.

multiplying device so that a small movement ofthe 4sector. 21, before Y.referred to, will move the rack bar 32 a sufficient distance to move a plate from the finisher and deliver it to the cooler and remove a plate fromthe cooler tothe final delivery. The forwarding movement Vof the forwarding rack 32 is stoppedby the'sector 21 running off thedriving worml 20,-theparts then op'- erating idly.

The mechanism whereby the-machine is locked while a plate is entering or is being delivered from the finisher, and by which, when the plate is correctly positioned in thel finisher the machine may be started, is operated from the shaft 22 and is controlled by the entering plate.

In the particular construction illustrated, there is provided an arm 35 loose on the shaft 22 (see Fig. 1). This arm supports one end of a rod 36 having a spring 37. and the other endv of this rod .36 is comiected to a lever 38 pivoted at 39, this lever connecting through a rod 40 with a latch plate 41, having a latching nose 42,. this latch plate being loose on a transverse clutch shaft 43. The spring 37 normally tends to throw the nose 42 under a stop 44 on a clutch lever 44 pivoted at 45 (see Fig. 3) in the frame of the machine, and acting to hold the lever against a downward movement and hold the lever so that it cannot be moved to cause an operation of the carrier until the nose 42 has beenV moved out of its relation with stop 44. Fast on the shaft 22 is a striker block 46, which, when in the position shown in Fig. 1, forces the spring rod 36 to the right and frees the nose 42 from the lever 44 so that the operator may start the machine.`

The plate forwarding rack 32, before referred to, is returned to position after forwarding the plate through a spring 47 secured to the frame and to a projection 47 on the sector shaft 22, before referred to, and which operates through the lever 24 to pull back the rack. The roll 13 is rocked by the movement of a plate against the action of a spring rod 48 of usual construction secured to the rock arm 14. Vhen a plate has passed beyond the roll the spring rocks-the arm 14 and thus swings the worm 20 away from the sector 21. The latter being now free the spring 47 can act to pull the lever 24 baolwardly and cause the backward or return movement of the rod 25 and the parts operated thereby. With this construction the machineY cannot be started until a plate is fully in position in the finisher.

in the best constructions, means will be provided for preventing a plate from operating the actuator roll 13 while the machine is operating, so as to prevent the roll 13 from setting into operation the mechanism described, and which might cause injury to parts of the machine. While this construction may be varied, in the particular construction illustrated, there is provided a pin 49 in advance of the roll 1,3 (see Figs. 3 and 4) which is actuated to rise in the path of an incoming plate and stop the advance of a plate while the' machine is in operation and before it gets to theV roll 13. This pin is actuated inthe construction illustrated, fromv anv arm 50 pivoted on a shaft 51 which at its other end carries a lever 52 connected to a link 53 in turn connected to a lever 54 having a roll 55 actuated from a groove 56 in a clutch hub 57 on shaft 43, before referred to.

The parts being in the position shown in Fig. 1, the operator moves the long lever 53 downwardly, which movement through lever 44 shifts the clutch hub 57 having the clutch face 57 to the left in Fig. 3 which then engages the coperating clutch member 57 thereby rotating the shaft 43 and causes a worm 59 mounted thereon to revolve and through it to turn the shell 9, before referred to, through a worm gear 60 on the shell with which worm 59 engages. Vhen the clutch hub 57 is thus moved into clutching engagement the lever 54 is actuated and causes the pin 49 to rise into the path of a plate. This pin 49 will, furthermore, act to lift a plate which might be in contact with the roll 13 off the roll if such plate should happen to be in that position when the machine was started.

The movable rib or ledge 11, before referred to, is formed on its rear or outer side with a beveled portion 61 which bears against a movable wedge 62, which in turn contacts with a cam piece 63 fixed on the frame of the machine. This ledge or rib 11 is normally forced upwardly into plate locking position by a spring 62, and acts to clamp the plate in the cylinder against the fixed rib or ledge 10. When the shell 9 is in position to receive a plate the ledge is depressed sufficiently to form a clearance so that a plate may enter the shell, but as soon as the cylinder commences to rotate the wedge 62 passes by the cam 63 and the spring acts to lift the rib or ledge and clamp the plate in the carrier. When the shell has made a revolution and the finished plate is ready to be moved the wedge 62 rides up on cam 63 and unlocks the plate which then settles on and is supported by the supporting bars, before referred to, the plate when released from the clamp being supported only by these bars.

In constructions embodying the invention, cooling devices will be employed for cooling the finished plate, and these devices will be of-such character that the plate is supported intermediate its straight edges while it is being fed or forwarded to the cooling devices, and while it is being cooled by such devices and, furthermore, the construction will be such that the plate will be brought into cooling relation with the cooling medium by a rotary movement, such movement effecting' a considerable saving in the size of the machine, which in many instances is a feature of practical importance.

The cooling mechanism, furthermore, will preferably be so constructed and operated that a dwell may be provided while the plate is-beingcool`ed to y'effect a more thorough cooling'of the plate and Ato permit the forwarding of a second plate to the cooling devices while the first one is being cooled. Furthermore, preferably the cooling mechanism will be such as to cool the plate on both the inside and outside.

A. cooling mechanism for effecting these results is illustrated in combination with the finishing mechanism hereinbefore described. It will be understood, that if desired, this cooler may be used alone or in combination with other types of finishing mechanism. Where, however, the cooler is used with a finisher to whichV and from which the plate is forwarded supported at points'intermediate it edges, the cooler will be provided with supports cooperating with the supports in the finisher to receive the plate and vsupport it intermediate its straight edges.

In the particular construction illustrated, there is provided a cooling bath which may be of various kinds, but which is shown in the form of a tank 65, which is supplied with a cooling Huid, as water, through an inlet pipe 66, an escape pipe 67 being provided for determining the height of the water level in the tank. The plate to be cooled is brought into cooling relation with this bath by `a rotary carrier, and in the best constructions, this rotary carrier is capacitated to carry two plates around and, furthermore, is driven so that there is a dwell or stop during the rotation of the carrier so that while one plate is being' fed on to the carrier, a plate previously fed thereto is stopped in the tank.

As the carrier is capacitated to carry two plates around, and as it is necessary for the water to be of sufficient depth to cover the plate, it is desirable to provide a tank construction whereby the Vwater is kept out of the carrier bearings and the adjacent parts of the finishing mechanism, and a construction for effecting thisy is provided by the present invention. As illustrated, the carrier' comprises a pair ofspaced heads 68, 69, formed Vpreferably integrally with a hollow hub V70, one end of which is closed, as indicated at 71. This hub is supported'by a shaft 72, which at its inner end (see Fig. 7) is provided with a reduced portion 7 3 which takes bearing in the knife bar 8 of the finisher, before referred to, and is held in position against rotation by pins 74;. The shaft is provided with aV collar 75 having a cut-away portion 7 6 to form a shoulder and secured to ythe hub in any suitable manner to rotate therewith is a driving sprocket 77, this driving Vsprocket rotating about the collar and having a shoulder 78 taking against the shoulder of the collar 75 and acting to prevent end play of theparts. The hub is, also, provided with a groove 79 in which takesa washer plate or ring 80 fsecuredfto the inner fendwall `81 ofthe tank 65. With this construction the water in the tank isv effectively prevented from entering thezbearings of the carrierfand the carrier is held in proper endwise relationA With the sition due tothe rotation of the carrier. These means are also of such character as to support the plate intermediate its straight edges and may be of anyy suitable character, as for instance, V'apair of rubber covered bars or pipes 83"'surrounding the outer'pe-v riphery of the carrier and supported in frames 83 extending from the heads as shown in Figf8.

In thebest constructions, means are provided for drying theplate after it has been cooled and preferably on `bothV sides Vand as the plate leaves thecarrier. While this may be accomplished in various ways, in the particular construction illustrated, there is provided an air `pipe 84 having upper and lower lbranches 85, 86, between which the Vplate passes as it `is -removed from the carrier, thesepipes being supplied with air from any suitable source, not shown, and acting to dry the outsideand inside of the plate. From the car-rier vthe plate may be' delivered to any suitable delivery, as for instance, a standard indicated at 8 V l The cooling carrier may be rotated iny any suitable manner. Where it is employed in combination with a finisher, it'is preferably driven from the finisher and in time `therewith. While the specific mechanismfor driving the carrier may be somewhat varied, inthe particular construction illustrated, the carrier is driven from the finisher shell 9, before referred to.` As shown, there is provided a sleeve 88` suitably supported in the machine frame, which forms a bearing for a short shaft 89. This short shaft has at one end a gear 90, the'teeth `of which are cut to engage with the :worm wheel on the shell 9, before referred to.v Theshort shaft 89 on its other end carries a sprocket 91,`and from this sprocket runs a' chain 92 over the sprocket 77 on the carrier hub before referred to','through which the carrier Yhub is rotated. As shown in the drawing, the gears 90 and the sprockets 77 and 91 are so pro- Vsov` supportinga plate When it is in reverse po-V portioned that the cooling carrier is given a 98, driven from a shaft 93. The shaft 15, before referred to,

cooling carrier is held in the bath while another plate is being forwarded to the cooling carrier.

Any suitable mechanism for driving the machine may be employed. As shown,

there is a main driving shaft 93 (see Fig. 3) driven in any suitable manner as from a pulley 94.. This shaft (see Fig. 1) carries a vsprocket 95 from which through a chain 96 the shaft 43, before referred to, is driven.

If desired, cutters may be employed for trimming the ends of the plate as the plate revolves in the carrier. These cutters are indicated in dotted lines in Fig. 3, and marked 97, and are carried on a short shaft gear 99 on the driving which carries the sector driving worm 2O is or may be driven from shaft 93 by a belt 100, shown in dotted lines in Fig. 1. If desired, high speed cutters 101 (see Fig. 5) may be mounted on this shaft and driven thereby for trimming the straight edges of the plate.

By the construction shown and described, a veryeiiicient cooling devicehas been provided and one which cools the plate without distortion and with great rapidity. Furthermore, owing to the provision of the rotary cooling devices the construction occupies less space than otherwise would be the case. While the cooler has been shown and described with a specific form of finisher, it will be understood that the cooler may be used with other types of finisher than that shown, and that the cooler furthermore may bevaried kas to its specific construction, and the inventionis not to be limited either to the precise type of finisher shown or to the precise construction of cooler.

What is claimed is:

1'.' The combination of a cooling bath, means for forwarding a plate, a rotary carrier, means for holding a plate on the carrier between its straight edges, and means for rotating the carrier to dip the plate in the bath.

2. The combination of means for forwarding a. plate, a cooling bath, a rotary carrier capacitated to carry two plates around, means for holding two plates on the carrier between their straight edges, and means for rotating the carrier to dip the plates in the bath.

3. The combination of means for forwarding a plate, a cooling bath, a rotary carrier in the bath capacitated to carry two plates around, means for holding two plates on the carrier between their straight edges, and means for rotating the carrier to dip the plates in the bath nand for stopping the carrier to hold one plate in the bath while another plate is being forwarded to the carrier.

efe." The combination of means for .forwarding ay plate supported between its straight edges, a cooling bath', a rotary carrierin the bath to which the plate is forwarded, means for holding a plate on the carrier between its straight edges, and means for rotating the carrier to dip the plate in the bath.

5. The combination of means for forwarding a plate supported between its straight edges, a cooling bath, a rotary carrier in the bath capacitated to carry two plates around, means for holding two plates on the carrier between their straight edges, and means for rotating the carrier to dip the plates in the bath. y Y

6. The combination of means for forwarding a plate supported between its straight edges, a cooling bath, Va rotary carrier in the bath Vcapacitated to carry two plates around, means for holding two plates on the carri-er between their straight edges, and means for rotating the carrier to dip the plates successively in the bath and for stopping the carrier to hold one plate in the bath while another plate is being forwarded to the carrier.

7. The combination of a tank, a carrier mounted to'move in the tank, means on the carriery for supporting a plate between its straight edges, and means for driving the carrier to dip a plate in the tank.

8. The combination of a tank, a rotary carrier in the tank, capacitated to carry two plates around, means on each half of the carrier for supporting the plates' between their straight edges, and means for driving the carrier.

9. The combination of a tank, a carrier mounted to rotate in the tank, bars on the carrier arranged to support a plate between its straight edges, and means for driving thisn carrier.

10. The combination of a tank, a carrier mounted to rotate in the tank, bars on the carrier arranged to support a plate between its straight edges, means for driving the carrier, and means for holding a plate on the carrier as it is rotated.

11. The combination of a tank, a rotary carrier in the tank, bars arranged to support a plate between its straight edges, holders spaced from the supporting bars arranged about the periphery of the carrier for holding the plate thereon when the carrier is rotated, and means for driving the carrier.

12. The combination of a tank, a rotary carrier mounted inthe tank, means for supporting a plate on the carrier between its straight edges, means for driving the carrier, means for forwarding aplate to the carrier and removing it therefrom, and means for drying a plate as it is removed from the carrier. i

13. The combination of ra 'finishing mechanism, a cooling bath arrangedV adjacent anism, Vmeans for forwarding a plate through the finishing mechanism supported between its straight edges, a cooling bath, a

rotary carrier to which the plate is forwarded AfromrtheI finishingV mechanism,

Vmeans for'supporting a plate between its straight edges on the carrier, and means for rotating the carrier to bring the plate into cooling relation with the bath.

15. The combination of a finishingmechanism, supportsl extending through the finishing mechanism arranged to support a Y a plate through between its'straight edges, a coolingbath ar-v plate between its straight edges, a cooling bath adjacent the finisher, a rotary carrier, supports on the carrier arranged to support between its straight edges, means for forwarding a plate through the finisher to the carrier, and means for rotatingthe carrierto bring a plate into cooling relation with the bath. A n

16. The combination of a finishing-mechanism, means for forwarding a plate the finishing mechanism supported ranged adjacent the finisher, ajrotary` carrier to Awhich `the plate is forwarded `from the nishing mechanism,means on the carrier for 4supporting a plate between its-straight edges, and means for intermittently rotating the carrier. 1

17. The combination of a cooling bath, a carrier having meansfor supporting a plate between its straight edges, and means'for effecting a relative movement of the bath andthe carrier to coolf the plate. i

. 18. The eombinationofa finishing mechanism, a cooling bathad'jacent thereto, means for forwarding a plate through the finishing mechanism supported .between its straight edges, means for bringing the plate into cooling relation with the bath while v supported between its straight edges, and

means for delivering the plate fromthe bath.

19. The combination of a finishing mechanism, a cooling bath, means for forwarding a plate through. the finishing-mechanism supported between its straight edges,na carrier to which the plate is forwardedcapacitated to carry two plates around, means for delivering 'a Yplate from the carrier and means for. moving-the carrier to bring a plate into cooling relation with the bath land for stoppingl the carrier while a plate is delivered therefrom and` another plate forwarded thereto. Y

. 20. The combinationof arfinishingmechanism, Va cooling bath adj acentfthereto, a car,-

rierl having means for supporting a plate finishing mechanism supported Y `'while supported between itsbetween its`. straight edges,`,mean s for forwarding a plate from the finishing 'means to thel carrier while supported between its' straight edges, and means for effecting a.V

22, rlhec'ombination of a finishing mech- Vaiiism,f a cooling bath 'arranged beyondYV the finishingmeehanism', a rotary carrier, means 4 forV forwarding a plateA fromtheV finishing mechanism. supported between itsA straight edges .to the rotary carrier, andv means for rotating the 'carrier inthe bath tol cool a plate onvboth sides.

23. Thecombination of a` finishing mechanism, a cooling bath, a rotary 'carrier mounted-to rotateyin the bath and arranged beyond the finishing mechanism, means for driving the finishing mechanism to finish a plate and connectionsfrom the finishing mechanism lfor 'rotating the carrier when the nishing! mechanism is driven..

2e. The combinationof a kfinishing cylinder, a rotary carrier, va cooling bath'in which the carrierv rotates, means forinte'rmittently driving `the nishing cylinder tov Afinish'a plate and connections from the cylinder for driving thevcarrier and causingit to partake of the intermittent movement ofthe cylinder.vr 4 Y g 25. The combination of a' finishing cylinder, a rotary carrier, a cooling bath in which the carrier rotates,jm'eans for intermittently driving the cylinder to finish 'a."plate,means for forwarding a plate into the cylinder' and from the cylindertothe. carrier, and connections for driving the carrier while the 'cylinder is driven, and stopping the'carrier Y termittentlydriving the/finishing mecha- Y n lsm to finish 1a plate Aand connections from the vfinishing mechanism for giving the carrier a half revolutionwvliile the finishing mechanism makes a whole revolution.

iio

' 27. The combination.ofa-cooling-bath, a

carrier having means forsupporting a plate between-' its straight edges, vandmeans for rotatingthe carrier'to .effect the coolingof a plate by the bath. y' y 28. The combinat'on of `al cooling bath, a carrier; having means for supporting a plurality of platesbetween their straighted es,

,and means forrotatingjthejcarrierto 4e ject the cooling of the plates by the bath.

V29 ,-[he combinationfof a .cooling;bath, a :a carrier having means for supporting two rotating the carrier to cause both sides of a plate to be wet by the bath.

32. The combination of a tank, a rotary 15 carrier in the tank having plate holding devices, and means for driving the carrier to submerge a plate in the tank.

In testimony whereoil I have hereunto set my hand.

OSCAR ROESEN. Witnesses:

R. W. ROBERTSON, P. J. WITTMER. 

